Scraper



Abril l, 1930. w. K, RoBBlNs 5 v 1,753,022

SCBAPER Filed Feb. 21, 1924 llii" g! m...u .i f l hnlllllllmln n Patented Apr. l, 1930 UNITED STATES PA'rEN'r oFFicE WILLIAM K. ROBBINS, CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, T IRA J'. WILSON, 0F CHICAGO, ILLINOIS scRArER Y Application-meid February 21, 1924. Serial No. 694,236.

. This invention pertains to drag Scrapers of the type adapted to be dragged back and forth and designed so that on forward movement it will enter t-he material to be transported and carry a load of the same along, and upon rearward movement the load will be left as the scraper moves away from it in the backward direction.

One of the primary purposes ofmy present invention is to provide a scraper of the character indicated comprising forwardly diverging side walls which, instead of merging at their rear ends into a closed apex, are joined by a transversely extending rear wall. This rear wall eliminates the acute angle atl the rear end of scrapers of this type into which the material being transported customarily packs so tightly that it is only with difficulty it is dislodged therefrom. In my present invention, as soon as movement of the scraper in a rearward direction is begun, the walls of the scraper, including the rear wall, back away from the material, the entire load of which is discharged without clinging to the scraper since it is not packed and wedged into any sharp corner.

Another purpose of the invention is to provide a scraper which will be more stable than the triangular scrapers heretofore employed,

i which result is accomplished by the transverse rear wall which not only affords a more stable base than a pointed base but also acts as a keel to hold the scraper in a straight line when in operation.

A further object of the invention is to provide a scraper which can be manufactured at a low cost, and since the side walls and transverse rear wall of my improved scraper are preferably made from a single piece of metal bent to the required shape, it will be obvious that the cost is considerably less than those Scrapers which terminate in an apex at their rear ends, for the reason that the production of a strong joint at such apex involves considerable reinforcing and consequent labor in assembling.

A further object of my invention isto provide a scraper which will cut the full width thereof and which will be provided with re- 59 placeable cutting and digging members adapted to readily enter the material to bc I moved and designed to cause the scraper to travel in a straight line whenl cutting, these members being readily removable and replaceable should they become worn out or broken.

Still another object of the invention is to provide a scraper having a maximum carrying capacity, which result is accomplished by mounting the cover or top plate above the upper edges of the side and rear walls; and a further object is to provide a scraper with means for preventing the same from tipping over forwardly should the front digging portions strike a solid obstruction, and for maintaining the scraper at the proper angle to most effectively cut and enter the material during the scraping operation,

Other yobjects and advantages of this invention should be readily understood and appreciated as the same becomes better understood by reference to the following description when considered in connection with the drawings.

Referring to the drawings:

Fig. l'is a plan view of a scraper embodying my invention.

Fig. 2 is a side elevation thereof, and

l Fig. 3 is a front elevation. i

In the preferred form of my invention, the body of the scraper comprises two side walls 4 and 5, respectively, and a rear wall 6 extending transversely of the scraper and uniting the rear ends of the side walls, said end and side walls being preferably formed from a single sheet of suitably heavy metal cut and bent to the desired shape. The lower portions of the side walls are bent inwardly as indicated by reference characters 7 and 8, and the corresponding portion of the rear wall 6 is bent' forwardly as indicated by reference character 9, the metal below the bending line of these walls being cut away at the-juncture of the rear and side walls so as to provide tight joints along the juncturelines l1 and l2 indicated in Fig. 3.

Wear plates 13, 14 and 15 are securely attached by rivets or otherwise tothe inclined portions .8, 9 and 7 respectively, of the wide and rear walls, which wearplates project beneatli the lower edges of the walls as shown in Figs 1 and 3, thus providing hardened cutting and scraping edges possessing greater durability under wear than the material of which the walls themselves are formed, and furthermore these wear plates can be removed and replaced by others when they become worn out or broken.

The rear wall 6 is provided on its outer face with a pair of upright spaced apart angle members 16 provided with openings to receive a link pin or the like by which the lead cable may be attached to the scraper. To the inner face of the rear wall acent its upper edge,

is fiXedly secured by rivets or otherwise an angle bracket 17 projecting above the upper edges of the wallsand forwardly from the rear wall in position to support the rearv edge of the cover plate 1S which acts as a float element for the scraper. Near their front ends the side walls l and 5 are provic ed with similar angle brackets lfland 21 upon which the front end ofthe cover platelS is supported. It will be manifest from an inspection of Figs. -.and S'that this cover plate is spaced above the edges of the walls of the scraper so that the material collected by the scraper i iay pile up therein to a point somewhat above the side walls, increasing the capacity of the scraper. rllhe top plate also serves to limit the depth to which the scraper will enter the material during the scraping operation.

Vhile the scraper constructed as described may be used without being equipped with cutting and digging members, in which instance the drag cables are connected directly to the forward edges of the side walls, nevertheless I prefer to equip the front edge of each side wall with a cutting and digging member preferably formed of cast manganese steel. These cutting and digging members are indicated on the drawings generally by reference characters 22 and 23, respectively, and each is shaped at its rear end t'oprovide a flange 24 adapted toembrace the outer face of the forward margin of itsside wall. Each member therefore comprises a vertical por-A tion forming a continuation of the vertical portion of the side wall and an inclined portion forming a continuation of the inclined portion of the side wall and its wear plate depending therefrom. The vertical and inclined portions of each cutting and digging member merge along a line indicated in Fig. 2 by reference character 24, andthis line inclines downwardly to the eXtreme lower forward point 25 of the member which becomes the principal cutting and digging point. Above this point the front edge of each member extends upwardly and is preferably inclined rearwardly toa point 26 from which the upper edge slopes rearwardly and upwardly to the upper rear end of the member. Since the verticalportions of the two cuttingA and digging members 22 and 23 eX- tend forwardly substantially parallel, as will be apparent from Fig. 1, it will be obvious that these members serve to maintain the scraper in the line of draft during the scraping operation and prevent it from twisting or turning sidewise. Furthermore, since they are disposed at the extreme forward ends of the scraper side walls they define the maximum cutting width of the scraper the cutting and ,digging portions being located at the line ofmafXimum width of the scraper, there are thus no following portions or projections which drag against the walls of the cut made bythe scraper. .Onegof the cutting and dig- Vging members22 removed from the scraper body is shown in dotted lines in Fig. 1. These members are secured to the body of the scraper by 'bolts or rivets so that they can be readily replaced-when occasion requires, or they may be removed entirely to provide a substantial scraper at a considerably lower price when the customer so desires. l

Each of the cutting and' digging members is provided with a plurality of apertures 27 for the attachment of a clevis 28 to which the rear ends of the drag .lines 29 are secured. The forward ends of these drag lines are attached to the bridle cable 31 through the intermediary of an eye 32.

For the purpose of regulating the angle at which the scraper will be tilted when in operation and for the further purpose of preventing the scraper from tipping overforwardly incase the cutting and digging members should strike a solid obstruction, I have provided a rigid bar or link 33 connected at its forward end to the eye 32and secured by a pin or bolt between two upright angle members 34 and'35 attached to the vertical ange of an angle bar 37, which is securely riveted to the forward margin of the top plate 18. In order to provide Vfor adjustability to regulate the angle of tilt of the scraper in accordance with the requirements of the material being moved, ,the link 33 is provided with a plurality of spaced apertures 38 through any desired one of which `the connection to the upright members 34 and 35 may be made.

It is believed that my invention, its mode of operation and many of its inherent advantages will be understood from the foregoing without further description,` and it should be Vmanifest that the structural details illustrated and described maybe varied within wide limits without departing from the essenceof the invention as defined in the following claims.

I claim:

1. The combination, with a scraper body comprising forwardly diverging side walls connected at ltheir rear ends by a transverse rear wall, the bottom of said scraper lbetween said side and rear walls remaining substantially open, of drag means connected with the forward ends 0f said side walls, a member rigidly attached to said body near the forward end thereof, and a rigid link providing an adjustable thrust connection between said member and said drag means for retaining said scraper in its operative position.

2. A drag scraper open at bottom and front havin` forwardl extendinoI side walls a 3. A drag scraper open at bottom and front'.

having forwardly extending` side walls and rigid means extending across the `upper forward portion of the walls for spacing them apart, a float element secured at its front to said means and at its rear to the rear of said .I

scraper, there being open spaces at the sides of said float element, ydrag means connected to the forward lower portions of said walls, and rigid means connected to the upper forward portion of the scraper and to said drag means at a substantial distance thereon forwardly of the scraper for regulating the inclination of the scraper relatively to the path of movement of said drag means.

4. A drag scraper having substantially vertical forwardly divergent side walls and a substantially vertical transverse rear wall, the lower portions of all of said walls extending inwardly, a cross brace extending across the upper forward portion thereof, and a float element secured at its front to said cross brace and at its rear to the rear wall of said scraper and free at its sides, drag means connected with the forward ends of said side walls, and a rigid link connected at its forward end with said drag means and at its rearward end with said cross brace, thereby providing a thrust connection for retaining said scraper in operative position.

5. A drag scraper having substantially vertical forwardly divergent side walls and a substantially vertical transverse rear wall, the lower portions of all of said walls extending inwardly, a cross 'brace extending across the upper forward portion thereof, and a float element secured at its front to said cross brace and at its rear to the rear wall of said scraper and free at its sides, there being open spaces at the sides of said float element, drag means connected with the forward ends of said side walls, and a rigid link connected at its forward end with said drag means at its rearward end with said cross-brace, thereby providing a thrust connection for retaining said scraper in operative position.

G. A drag scraper having substantially vertically forwardly divergent side walls and a substantially verticaly transverse rear wall. the lower portions of all of said walls extending inwardl a cross brace extending across the rupper forward portion thereof, and a float element secured at its front to said cross brace and at its rear to the rear wall of` said scraper and free at its sides, there being open spaces at the sides and rear of said float ele-- ment, drag means connected with the forward ends of said side walls, and a rigid link connected at its forward'end with said drag means and at its rearward end with said cross brace, thereby providing a thrust connection for retaining said scraper. in operative position.`

u 7. The combination with a scraper body comprising forwardly diverging side walls connected at their rear ends by a transverse rear wall, the bottom of said scraper between Vsaid side and rear walls remaining substantially open, of drag means connected with the forward ends of said side wallsand a rigid link connected at its forward end with said drag means and adjustably connected at its rear endl with the upper forward portion of said scraper body, thereby providing an adjustable thrust connection between said drag means and said scraper body for retaining the latter in operative position.

8. A drag scraper open at its bottom and front having outwardly diverging and forwardly extending side walls, the rear portions of said walls being joined to an upwardly extending rear wall at the rear of said scraper, said rear wall having sufficient width between the side walls as to prevent packing of earth in the rear of the scraper, a float element at the top of said scraper for receiving the upward thrust of a full load of scraped material to raise the scraper out of scraping relation to the surface over which it moves, drag means connected to the lower front portions of said side walls, and `rigid means connected to the upper portion of the scraper and to the drag means at a substantial distance thereon forwardly of the scraper for regulating the inclination of the scraper relatively to the path of movement of the drag means.

9. A drag scraper open at its bottom and front having outwardly diverging and forwardly extending side walls, the rear portions of said walls being joined to an upwardly extending rear wall at the rear of said scraper, said rear wall having sufficient width between the side walls as to prevent packing of earth in the rear of the scraper, a float ele ment at the top of said scraper for receiving the upward thrust of a full load of scraped material to raise the scraper out of scraping relation to the surface over which it moves, flexible drag means connected to the lower forward portions of said side walls, and rigid means connected to the upper forward portion of said scraper and to the flexible means Aen at a substantial distance thereon `forwardly of the scraper for regulating the inclination of the scraper relatively to the path of movement of said drag means.

l0. A drag scraper open at its bottom and front having outwardly diverging and-forwardly extending side walls, the rear portions of said walls being joined to an upward- .ly extending rear wall at the rear of said scraper, said rear wall having suiiicient width between the side Wallsas to prevent packing of earth in the rear of the scraper, a float element at the top of said scraper for receiving the upward thrust of a full load of scraped material to raise the scraper out of scraping relation to the surface over which it moves, flexible drag means connected to the lower forward portions ofsaid side walls, and rigid means connected to the eXible means at a substantial distance thereon forwardly of the scraper and to the upper portion of the scraper at a point. rearwardly of the point of attachment or" the drag means to said scraper for regulating the inclination of said scraper ,to the path of movement of said dra(y means.

WILLIAM K. RoBiNs. 

